/* vf_blackframe.c - detect frames that are (almost) black * * $Id$ * * search for black frames to detect scene transitions * (c) 2006 Julian Hall * * based on code designed for skipping commercials * (c) 2002-2003 Brian J. Murrell * * cleanup, simplify, speedup (c) 2006 by Ivo van Poorten * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "config.h" #include "mp_msg.h" #include "img_format.h" #include "mp_image.h" #include "vf.h" struct vf_priv_s { unsigned int bamount, bthresh, frame, lastkeyframe; }; static int config(struct vf_instance_s* vf, int width, int height, int d_width, int d_height, unsigned int flags, unsigned int outfmt) { return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt); } static int query_format(struct vf_instance_s *vf, unsigned fmt) { switch(fmt) { case IMGFMT_YVU9: case IMGFMT_IF09: case IMGFMT_YV12: case IMGFMT_I420: case IMGFMT_IYUV: case IMGFMT_CLPL: case IMGFMT_Y800: case IMGFMT_Y8: case IMGFMT_NV12: case IMGFMT_NV21: case IMGFMT_444P: case IMGFMT_422P: case IMGFMT_411P: case IMGFMT_HM12: return vf_next_query_format(vf, fmt); } return 0; } static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts){ mp_image_t *dmpi; int x, y; int nblack=0, pblack=0; unsigned char *yplane = mpi->planes[0]; unsigned int ystride = mpi->stride[0]; int pict_type = mpi->pict_type; int w = mpi->w, h = mpi->h; int bthresh = vf->priv->bthresh; int bamount = vf->priv->bamount; static const char *const picttypes[4] = { "unknown", "I", "P", "B" }; for (y=1; y<=h; y++) { for (x=0; x<w; x++) nblack += yplane[x] < bthresh; pblack = nblack*100/(w*y); if (pblack < bamount) break; yplane += ystride; } if (pict_type > 3 || pict_type < 0) pict_type = 0; if (pict_type == 1) vf->priv->lastkeyframe = vf->priv->frame; if (pblack >= bamount) mp_msg(MSGT_VFILTER, MSGL_INFO,"vf_blackframe: %u, %i%%, %s (I:%u)\n", vf->priv->frame, pblack, picttypes[pict_type], vf->priv->lastkeyframe); vf->priv->frame++; dmpi = vf_get_image(vf->next, mpi->imgfmt, MP_IMGTYPE_EXPORT, 0, mpi->width, mpi->height); dmpi->planes[0] = mpi->planes[0]; dmpi->stride[0] = mpi->stride[0]; dmpi->planes[1] = mpi->planes[1]; dmpi->stride[1] = mpi->stride[1]; dmpi->planes[2] = mpi->planes[2]; dmpi->stride[2] = mpi->stride[2]; vf_clone_mpi_attributes(dmpi, mpi); return vf_next_put_image(vf, dmpi, pts); } static int control(struct vf_instance_s* vf, int request, void* data){ return vf_next_control(vf,request,data); } static void uninit(struct vf_instance_s *vf) { if (vf->priv) free(vf->priv); } static int open(vf_instance_t *vf, char* args){ vf->priv = malloc(sizeof(struct vf_priv_s)); if (!vf->priv) return 0; vf->config = config; vf->put_image = put_image; vf->control = control; vf->uninit = uninit; vf->query_format = query_format; vf->priv->bamount = 98; vf->priv->bthresh = 0x20; vf->priv->frame = 0; vf->priv->lastkeyframe = 0; if (args) sscanf(args, "%u:%u", &vf->priv->bamount, &vf->priv->bthresh); return 1; } const vf_info_t vf_info_blackframe = { "detects black frames", "blackframe", "Brian J. Murrell, Julian Hall, Ivo van Poorten", "Useful for detecting scene transitions", open, NULL };